Vasia Kalavri created FLINK-3080:
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             Summary: Cannot union a data stream with a product of itself
                 Key: FLINK-3080
                 URL: https://issues.apache.org/jira/browse/FLINK-3080
             Project: Flink
          Issue Type: Bug
          Components: Streaming
    Affects Versions: 0.10.0
            Reporter: Vasia Kalavri


Currently it is not possible to union a stream with itself or a product of 
itself.
For example, the following code
{{stream.union(stream.map(...))}}
fails with this exception: "A DataStream cannot be unioned with itself".
The documentation currently states that "If you union a data stream with itself 
you will still only get each element once." and should also be updated.



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